drm/i915/cnl: Add support for horizontal plane flipping

CNL supports horizontal plane flipping on non-linear plane formats.

v2:
- Avoid BUG unlike elsewhere in the code (Ville)
- Hoist the rotation-tiling restriction check (Ville)

v3 (Rodrigo):
- Rebased after a while.
- Fix small indentation issues.

Bspec: 7656
Suggested-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171215213800.7896-1-rodrigo.vivi@intel.com

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 09bf043..14ade8f 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6329,6 +6329,7 @@ enum {
 #define   PLANE_CTL_TILED_X                    (  1 << 10)
 #define   PLANE_CTL_TILED_Y                    (  4 << 10)
 #define   PLANE_CTL_TILED_YF                   (  5 << 10)
+#define   PLANE_CTL_FLIP_HORIZONTAL            (  1 << 8)
 #define   PLANE_CTL_ALPHA_MASK                 (0x3 << 4) /* Pre-GLK */
 #define   PLANE_CTL_ALPHA_DISABLE              (  0 << 4)
 #define   PLANE_CTL_ALPHA_SW_PREMULTIPLY       (  2 << 4)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index efa6c6d..fb5ee41 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3073,6 +3073,12 @@ int skl_check_plane_surface(struct intel_plane_state *plane_state)
        unsigned int rotation = plane_state->base.rotation;
        int ret;
 
+       if (rotation & DRM_MODE_REFLECT_X &&
+           fb->modifier == DRM_FORMAT_MOD_LINEAR) {
+               DRM_DEBUG_KMS("horizontal flip is not supported with linear surface formats\n");
+               return -EINVAL;
+       }
+
        if (!plane_state->base.visible)
                return 0;
 
@@ -3453,9 +3459,9 @@ static u32 skl_plane_ctl_tiling(uint64_t fb_modifier)
        return 0;
 }
 
-static u32 skl_plane_ctl_rotation(unsigned int rotation)
+static u32 skl_plane_ctl_rotate(unsigned int rotate)
 {
-       switch (rotation) {
+       switch (rotate) {
        case DRM_MODE_ROTATE_0:
                break;
        /*
@@ -3469,7 +3475,22 @@ static u32 skl_plane_ctl_rotation(unsigned int rotation)
        case DRM_MODE_ROTATE_270:
                return PLANE_CTL_ROTATE_90;
        default:
-               MISSING_CASE(rotation);
+               MISSING_CASE(rotate);
+       }
+
+       return 0;
+}
+
+static u32 cnl_plane_ctl_flip(unsigned int reflect)
+{
+       switch (reflect) {
+       case 0:
+               break;
+       case DRM_MODE_REFLECT_X:
+               return PLANE_CTL_FLIP_HORIZONTAL;
+       case DRM_MODE_REFLECT_Y:
+       default:
+               MISSING_CASE(reflect);
        }
 
        return 0;
@@ -3497,7 +3518,11 @@ u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
 
        plane_ctl |= skl_plane_ctl_format(fb->format->format);
        plane_ctl |= skl_plane_ctl_tiling(fb->modifier);
-       plane_ctl |= skl_plane_ctl_rotation(rotation);
+       plane_ctl |= skl_plane_ctl_rotate(rotation & DRM_MODE_ROTATE_MASK);
+
+       if (INTEL_GEN(dev_priv) >= 10)
+               plane_ctl |= cnl_plane_ctl_flip(rotation &
+                                               DRM_MODE_REFLECT_MASK);
 
        if (key->flags & I915_SET_COLORKEY_DESTINATION)
                plane_ctl |= PLANE_CTL_KEY_ENABLE_DESTINATION;
@@ -13300,7 +13325,12 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
        if (ret)
                goto fail;
 
-       if (INTEL_GEN(dev_priv) >= 9) {
+       if (INTEL_GEN(dev_priv) >= 10) {
+               supported_rotations =
+                       DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_90 |
+                       DRM_MODE_ROTATE_180 | DRM_MODE_ROTATE_270 |
+                       DRM_MODE_REFLECT_X;
+       } else if (INTEL_GEN(dev_priv) >= 9) {
                supported_rotations =
                        DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_90 |
                        DRM_MODE_ROTATE_180 | DRM_MODE_ROTATE_270;